Lay out tree or forest
[x,y] = treelayout(parent,post)
[x,y,h,s] = treelayout(parent,post)
[x,y] = treelayout(parent,post) lays
out a tree or a forest. parent is the vector of
parent pointers, with 0 for a root. post is
an optional postorder permutation on the tree nodes. If you omit post, treelayout computes
it. x and y are vectors of coordinates
in the unit square at which to lay out the nodes of the tree to make
a nice picture.
[x,y,h,s] = treelayout(parent,post) also
returns the height of the tree h and the number
of vertices s in the top-level separator.